Watson
About the Watson PCB
Watson is an open source PCB design by paretech, published on GitHub. It is a 2-layer board measuring 84 × 30 mm, with 48 components from 26 distinct parts.
Other key parts include the KA78L05AMTF, KA79L05AMTF, AD8031, AD603ARZ and AD8307ARZ. By type, the board carries 22 capacitors, 10 resistors, 6 inductors, 5 ICs, 1 connector and 1 fuse.
It belongs with the audio and test & measurement designs in this gallery.
From the project
PCB layout and test results for a simple high dynamic range power meter based on the Analog Devices AD8307 Logarithmic Amplifier.
Watson is a relatively simple RF power meter based on the "120 dB Measurement System" outlined in the Analog Devices (AD) AD8307 data sheet. Watson has a narrow and fixed measurement band centered on 10.7 MHz and was developed as the detector for a low cost spectrum analyzer design.
Main components on the Watson
Watson bill of materials (BOM)
48 components, 26 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | KA78L05AMTF 78L05 FAIRCHILD SEMICONDUCTOR (VA) | sot89 | U1 |
| 1 | KA79L05AMTF 79L05 FAIRCHILD SEMICONDUCTOR (VA) | sot89 | U2 |
| 1 | AD8031 | sot23 | U3 |
| 1 | AD603ARZ AD603 ANALOG DEVICES INC | so-8 | U4 |
| 1 | AD8307ARZ AD8307 ANALOG DEVICES INC | AD8307 | U5 |
| 1 | 142-0701-801 BNC EMERSON NETWORK POWER CONNECTIVITY JOHNSON | sma-edge-062 | P5 |
| 2 | CONN_1 | PIN_ARRAY_1 | +12V, -12V |
| 1 | SFECF10M7GA00-R0 BPF MURATA ELECTRONICS (VA) | SFEC | F1 |
| 1 | SM-42TW502 5k COPAL ELECTRONICS INC (VA) | VRSM3932_JHOOK | RV1 |
| 1 | LQW2UASR75J00L 750nH MURATA ELECTRONICS (VA) | 180mm_ChipCoil | L1 |
| 5 | BLM18HE152SN1D L MURATA ELECTRONICS (VA) | SM0603_Inductor | L2, L3, L4, L5, L6 |
| 2 | T498A334K035ZTE11K 33u KEMET (VA) | c_tant_A | C1, C4 |
| 1 | .1u | SM0603_Capa | C2 |
| 11 | C | SM0603_Capa | C3, C6, C7, C8, C9, C12, C13, C14 +3 |
| 5 | 0.1u | SM0603_Capa | C5, C11, C18, C20, C21 |
| 1 | C1608C0G1H151F080AA 150p TDK CORPORATION (VA) | SM0603_Capa | C10 |
| 2 | 1n | SM0603_Capa | C17, C22 |
| 1 | 187k | SM0603_Resistor | R1 |
| 1 | 28k | SM0603_Resistor | R2 |
| 1 | 330 | SM0603_Resistor | R3 |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 464 | SM0603_Resistor | R4 |
| 1 | 100k | SM0603_Resistor | R5 |
| 1 | 20k | SM0603_Resistor | R6 |
| 1 | 80.6k | SM0603_Resistor | R7 |
| 1 | 4.7 | SM0603_Resistor | R8 |
| 2 | R | SM0603_Resistor | R9, R10 |
Watson design files
The KiCad project lives in the paretech/Watson repository on GitHub; these links point at the commit this page was built from.
Watson: common questions
How big is the Watson PCB?
The Watson measures 84 × 30 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Watson?
48 components, from 26 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Watson design files?
From the paretech/Watson repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Watson design in my own project?
The repository has no license, so all rights stay with paretech. Use it as a reference, and ask the author before reusing the design.
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